Achilles Tendinitis / Rupture

The Achilles tendon is a thick, fibrous cord that connects the calf muscles, making it essential for everyday movement. It plays a vital role in walking, running, jumping and push-off power.

Achilles tendinitis refers to irritation, inflammation and degeneration of the tendon due to overuse or mechanical stress. In more severe cases, the tendon may partially or completely rupture.

What causes achilles tendinitis / rupture?

Achilles tendon problems typically arise when the tendon is repeatedly overloaded beyond its capacity to adapt. Some of the common contributing factors include:

• Age-related degeneration — tendon elasticity diminishes with age, making it more susceptible to microtears.
• Overuse and repetitive strain — frequent running, jumping or uphill activity without adequate loading progression.
• Sudden increase in training intensity or volume — rapid spikes in mileage, speed or training frequency.
• Tight calf muscles or limited ankle flexibility — restricted motion increases strain on the tendon during push-off.
• Muscle imbalances — weakness in calf or foot muscles can shift excessive load onto the tendon.

In contrast, a rupture most often occurs during a sudden forceful movement, such as sprinting, jumping or pushing off explosively.

What are the symptoms of achilles tendinitis / rupture?

Symptoms of Achilles tendinitis may develop gradually and include:

• Pain and stiffness along the back of the ankle or heel, especially with activity
• Tenderness when touching the tendon
• Swelling or warmth around the tendon area
• Pain that worsens at the beginning of activity and eases with rest
• Tightness in the calf after periods of inactivity

Meanwhile, a rupture typically presents with:

• A sudden, sharp pain in the back of the heel or lower calf
• A feeling of being hit or kicked in the back of the leg
• Difficulty pushing off the injured foot
• Weakness in walking or inability to stand on tiptoe
• A gap or depression is felt in the tendon area (in complete ruptures)

Who is more vulnerable to achilles tendinitis / rupture?

Certain individuals are more likely to develop Achilles problems due to:

• Older adults — adults in their 30s to 50s are more vulnerable due to gradual age-related changes in tendon elasticity and blood supply, making the Achilles more vulnerable to degeneration and tearing under stress.
• Foot mechanics issues — overpronation or flat feet alter force transmission through the ankle and heel, increasing cumulative load on the tendon during activity.
• Athletes in explosive sports — basketball, tennis and football place high eccentric and acceleration forces through the tendon, increasing the likelihood of microtrauma or acute rupture.
• People with limited flexibility or strength deficits — these conditions place increased tensile strain on the Achilles tendon during walking and push-off, accelerating tendon wear over time.
• Recreational runners — these individuals are at higher risk because sudden fluctuations in running volume or intensity can overload the Achilles tendon before it has time to adapt.
• Those with previous Achilles pain or injury — prior tendinitis or microtears may have underlying tendon degeneration or weakened fibres, reducing the tendon’s capacity to tolerate repeated loading.

What are the complications associated with achilles tendinitis?

Without appropriate management, Achilles conditions can progress and lead to complications such as:

• Complete rupture — loss of continuity through the tendon, requiring more intensive treatment.
• Chronic tendinopathy — long-standing tendon degeneration with persistent discomfort.
• Reduced function and performance — persistent pain or weakness limiting activity.
• Altered gait mechanics — compensatory movement patterns increase the risk of knee, hip or back issues.

How is achilles tendinitis / rupture diagnosed in Singapore?

Dr James Tan performs a structured assessment to confirm Achilles tendon pathology, determine whether the injury is inflammatory, degenerative or ruptured, and exclude other causes of heel or calf pain.

The process involves:

• Clinical history — a detailed clinical history helps establish how the injury developed and what factors may be contributing to tendon overload. This includes:
  • Onset of pain or sudden injury
  • Recent changes in activity, training intensity or footwear
  • Previous Achilles symptoms or injuries
  • Occupational or sporting demands that stress the tendon
• Symptom review — symptom patterns provide important clues about severity and tendon integrity. Dr James Tan will assess:
  • Location and nature of pain
  • Sudden loss of strength or push-off ability
  • Functional limitations in walking, running or climbing stairs
• Physical examination — a focused examination assesses tendon structure and function, including:
  • Palpation for tenderness, thickening or gaps along the tendon
  • Assessment of ankle range of motion and calf flexibility
  • Strength testing and functional tasks, such as heel raises
  • Specific clinical tests to assess tendon rupture when suspected
• Imaging examination — imaging is used selectively to confirm the diagnosis or assess severity:
  • Ultrasound  — evaluates tendon thickness, degeneration and partial tears in real time.
  • Magnetic Resonance Imaging (MRI)  — provides a detailed assessment of tendon integrity, surrounding tissues and extent of injury when symptoms are severe, persistent or unclear.

How is achilles tendinitis / rupture treated in Singapore?

Treatment for Achilles tendinitis or rupture is individualised and depends on the extent of tendon damage, symptom duration and functional demands. It aims to reduce pain, promote tendon healing and support a safe return to activity.

Conservative management

• Activity modification — reducing or avoiding activities that place excessive strain on the Achilles tendon, particularly running, jumping or uphill walking, to allow symptoms to settle.
• Load reduction strategies — temporary adjustments to training intensity or frequency to prevent further tendon overload.
• Footwear optimisation — reviewing shoe support and heel cushioning to reduce tensile stress on the tendon during daily activities.
• Short-term pain relief — simple analgesics may be used selectively to manage discomfort while rehabilitation is initiated.

Non-surgical interventions

• Shockwave Therapy (ESWT) — used in selected cases of chronic Achilles tendinopathy to stimulate tissue healing, improve pain and support tendon recovery when symptoms persist despite conservative care.
• Platelet-Rich Plasma (PRP) injections — occasionally considered in cases of ongoing tendinopathy where degenerative tendon changes are present, intending to promote tissue repair using the body’s own growth factors.
• Temporary immobilisation or bracing — may be recommended in partial tears or significant inflammation to protect the tendon during early healing phases.

Surgical management (selected cases)

• Arthroscopy (Ankle) — minimally invasive techniques may be used to address associated ankle pathology or contributing intra-articular issues where relevant.
• Open or minimally invasive tendon repair — considered in complete Achilles ruptures or severe tendon damage when non-surgical management is unlikely to restore adequate strength or function.

Rehabilitation and recovery

• Progressive strengthening programmes — focused on restoring calf strength and tendon load tolerance in a controlled manner.
• Flexibility and mobility training — addressing calf tightness and ankle stiffness that increase strain on the Achilles tendon.
• Neuromuscular re-education — improving coordination, balance and push-off mechanics during walking and sport-specific movements.
• Graduated return-to-activity planning — structured progression back to running or sport based on symptom response and functional milestones.
• Recurrence prevention strategies — education on training progression, recovery practices and early symptom recognition.

Book an Appointment

Achilles pain is often attributed to training fatigue, but it can also signal structural changes that warrant professional evaluation. 

Whether you are struggling with persistent tendon pain or a sudden loss of push-off strength, booking an appointment with Dr James Tan allows for a comprehensive assessment and an evidence-based recovery plan. Focused care can help you return to activity with confidence and reduce the risk of future injury.